Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Twin Quasar is also known as SBS 0957+561, or TXS 0957+561. It was the first identified gravitationally lensed object. A gravitational lens refers to a distribution of matter (such as a cluster of galaxies) between a distant source (a background galaxy) and an observer, that is capable of bending (lensing) the light from the source, as it travels towards the observer. This effect is known as gravitational lensing and is one of the predictions of Albert Einstein's General Theory of Relativity.

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